Abstract
The Chinese Beidou system, also known as Compass, has entered its trial operational stage and can already provide services for triple-frequency users. Using triple-frequency signals is expected to be of great benefit for ambiguity resolution. Based on error characteristic analysis of the Beidou frequencies, we introduce the procedure of selecting the best combinations of triple-frequency signals. The geometry-based model and geometry-free model of triple-frequency signals are presented. Three triple-frequency carrier ambiguity resolution (TCAR) methods are described, which include the cascading rounding method, the stepwise AR method and the modified stepwise AR method. In order to evaluate the performance of these methods, observations from baselines of various lengths were collected using Beidou triple-frequency receivers and were processed epoch-by-epoch using the three methods. The same observation data were also processed in a dual-frequency mode for comparison. The results show that, compared to the dual-frequency based solution, the single epoch ambiguity resolution success rate with triple frequency improved nearly 30 % for the short baselines (<20 km) and 100 % for the mid-length baselines (20–50 km) using the proposed modified stepwise AR method.
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Acknowledgments
The work is partially sponsored by Natural Science Foundation of China (grant no. 41004014), partially sponsored by National 863 Project of China (2012AA12A202), and partially supported by “the Fundamental Research Funds for the Central Universities (No. 2012214020208)”. The authors are very grateful to the anonymous reviewers for their constructive comments and suggestions.
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Tang, W., Deng, C., Shi, C. et al. Triple-frequency carrier ambiguity resolution for Beidou navigation satellite system. GPS Solut 18, 335–344 (2014). https://doi.org/10.1007/s10291-013-0333-9
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DOI: https://doi.org/10.1007/s10291-013-0333-9